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random bit not in executable

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NIIBE Yutaka
2011-02-07 11:57:27 +09:00
parent 103484c44a
commit 21bcf76d36
8 changed files with 72 additions and 43 deletions
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10
src/random.c
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@@ -25,24 +25,22 @@
#include "ch.h"
#include "gnuk.h"
extern void *_binary_random_bits_start;
const uint8_t *
random_bytes_get (void)
{
uint32_t addr, addr0;
addr = (uint32_t)&_binary_random_bits_start + ((hardclock () << 5) & 0x3e0);
addr = (uint32_t)&random_bits_start + ((hardclock () << 5) & 0x3e0);
addr0 = addr;
while (1)
{
if (*(uint32_t *)addr != 0)
if (*(uint32_t *)addr != 0 && *(uint32_t *)addr != 0xffffffff)
break;
addr += 32;
if (addr >= ((uint32_t)&_binary_random_bits_start) + 1024)
addr = ((uint32_t)&_binary_random_bits_start);
if (addr >= ((uint32_t)&random_bits_start) + 1024)
addr = ((uint32_t)&random_bits_start);
if (addr == addr0)
fatal (FATAL_RANDOM);